Need to add doc owners.emailAddress in structured request to support pipeline automation

[georgebzheng]

Per discussion with Rob Mosley and Anastasia during the PI meeting in January 2021, we would like to extend the current pipeline automation to support automated email notification to ER author upon completion of DC and PDT analyses.

GoogleDoc contains owners -> emailAddress (see https://developers.google.com/drive/api/v3/reference/files) that can be retrieved. We currently rely on structured request to store such information. Since Mongo doesn't like the dot notation, suggest to use owner_email_addresses as the name of the new field in structured request with addresses stored in a list.